Bussmann 170M3389 High-Speed Square Body Fuse, Class aR, 63A, 700V

Bussmann 170M3389 High-Speed Square Body Fuse, Class aR, 63A, 700V

The Bussmann 170M3389 is an Eaton Bussmann series high-speed square body fuse engineered for semiconductor protection in demanding industrial power electronics applications. Rated 700V (UL) / 690V (IEC), 63A, with a 100 kAIC interrupting rating and a 1250V AC voltage rating, this Class aR fuse features a flush end, square body construction designed for fast, reliable clearing of fault currents to safeguard sensitive semiconductor devices. Its Class aR (aR) utilization category suits it to coordinated protection schemes used alongside semiconductor overload protection.

Key Features

• Compact Square Body Design: Square body, flush end contacts measuring 60 mm height, 160 mm length/depth, and 92 mm width, at 351 g, for space-efficient mounting.
• Class aR Utilization Category: Accompanied semiconductor protection classification (aR) for coordinated fault current interruption in power electronics circuits.
• High Interrupting Capacity: 100 kAIC rating delivers robust short-circuit protection for high-fault-current environments.
• Dual Voltage Rating: Rated 700V (UL) and 690V (IEC), with a 1250V AC voltage rating for broad application coverage across UL- and IEC-compliant systems.
• 63A Amperage Rating: Sized for semiconductor protection circuits requiring precise current coordination.
• Engineered Let-Through Characteristics: Pre-arc I²t rating of 215 and clearing I²t of 1300 at 1000V / 1750 at 1250V provide predictable current-limiting performance for semiconductor devices.
• Low Watt Losses: 20W watt loss rating supports efficient thermal management in enclosed power electronics equipment.

Certifications & Compliance

• IEC Rated
• CE Marked

Technical Specifications

• Amperage Rating: 63 A
• Application: semiconductor protection
• Certifications: IEC Rated
• Clearing I2t: 1300 at 1000 V, 1750 at 1250 V
• Compliances: CE Marked
• Fuse Shape: Square body, flush end contacts
• Insulated Metal Gripping Lugs (Imgl): No
• Packaging Type: Standard
• Pre Arc I2t: 215
• Product Height: 60 mm
• Product Length Depth: 160 mm
• Product Weight: 351 g
• Product Width: 92 mm
• Utilization Category: aR (accompanied semiconductor protection)
• Voltage Rating: 1250 V
• Voltage Type: AC
• Watt Losses: 20 W

Typical Applications

• Semiconductor Device Protection
• Power Electronics and Converter Circuits
• High-Speed Fault Current Interruption
• Industrial and Commercial Electrical Systems

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the 170M3389 reflects that standard with its Class aR utilization category, 100 kAIC interrupting rating, and IEC-rated, CE-marked compliance. For engineers specifying semiconductor protection in power electronics, this square body fuse delivers the coordinated, high-speed clearing performance reliable installations demand.